I don't see much use for a UV filter except as a lens protector. Better off using a polarizing filter unless you need every bit of available light, in which case it's not likely to make much if any difference.
As often happens, your wife...
The filter that came with your drone is a UV filter and works just fine for cloudy and sunny days.
It's a bad idea to leave a polariser on all the time.
Ignore any suggestions it can't hurt.
To do so would result in a big cut to the light...